Software Engineer

Software Engineer Subject Matter Expert (SME)Join a mission that matters! Are you a highly skilled Software Engineer ready to tackle complex technical challenges that directly support our nation's intelligence mission? Leidos is seeking an accomplished Software Engineer Subject Matter Expert (SME) to join the Chinook Program supporting our Intelligence Community customer. This is an exciting opportunity to bring your software engineering expertise to a high-impact mission where innovation, technical excellence, and teamwork make a real difference. You will work alongside talented engineers, architects, mission experts, and government stakeholders to develop and deliver secure, scalable, and modern software capabilities that support critical national security objectives. As a Software Engineer SME, you won't simply be writing code, you'll help shape technical solutions, influence architecture, solve challenging engineering problems, and elevate the capabilities of the team around you. We are looking for a hands-on technical leader who thrives in a collaborative environment and is excited about applying modern software engineering practices to meaningful mission challenges. In this role you will provide hands-on technical leadership across the full software development lifecycle, designing, developing, integrating, testing, deploying, and maintaining mission-critical applications and services. The SME will serve as a senior technical authority within the development team, helping establish sound engineering practices, resolve complex technical challenges, mentor other engineers, and collaborate closely with government and contractor stakeholders.Position may be performed in the following locations:Gaithersburg, MDAlexandria, VAChantilly, VAEnglewood, COSt. Louis, MOTucson, AZClearance Level Required: Active Top Secret/SCI with the ability to successfully pass a Polygraph examination. Primary Responsibilities:Serve as the senior technical SME and technical advisor for mission applications under the Chinook program.Design, develop, integrate, test, deploy, and maintain modern web applications and backend services.Develop scalable, maintainable, and secure software across both front-end and back-end tiers.Translate mission and technical requirements into robust software architecture and implementation plans.Provide technical leadership in software design, architecture, coding standards, code reviews, and engineering best practices.Develop and maintain RESTful APIs, microservices, data services, and system integrations.Build responsive and user-focused front-end interfaces using modern web development frameworksDesign and optimize database schemas, queries, data-access layers, and data-processing workflows.Troubleshoot complex application, integration, performance, and production issues.Support automated testing, continuous integration/continuous delivery (CI/CD), and DevSecOps practices.Contribute to containerized and cloud-enabled application environments as applicable to the program.Participate in Agile/Scrum ceremonies, sprint planning, backlog refinement, demonstrations, and technical working sessions.Mentor junior and mid-level software engineers and promote consistent engineering practices across the team.Identify opportunities to improve application performance, reliability, security, scalability, and maintainability.Evaluate emerging technologies and recommend solutions based on mission requirements and technical feasibility.Basic Qualifications:US citizenship is required per contract.Bachelor's degree in Computer Science, Software Engineering, or related field and 12-15 years of prior relevant experience or Master's with 10-13 years of prior relevant experience.Proficient with the following technologies:Web: HTML, CSS, JSON, and REST APIsObject-oriented Programming: Python, Java, and JavaScriptAdvanced Programming: GoFront-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django, Node.js, Flask, or Svelte.Cloud Development:Multi-cloud architectures: AWS, IBM, Google, Azure, and Oracle.Specific AWS Services: S3, SQS, SNS, EC2, CloudFormation and RDSRelational Database: MySQL, PostgreSQL, or SQL ServerNoSQL Database: OpenSearch/Elasticsearch.Operating System: Windows, LinuxVersion Control System: GitProficiency with AWS (C2S/GovCloud) and Infrastructure-as-Code (Terraform, CloudFormation).Established experience building and deploying containerized services (Docker/Kubernetes).Solid understanding of DevSecOps tools: GitLab CI/CD, Jenkins, SonarQube, Nexus, Keycloak, Vault.In depth knowledge of Agile/Scrum practices and tools (JIRA, Confluence)Solid understanding of customer specific data types and standards, such as OGC WMS/WFS, NSG, and GEOINT workflows.Preferred Qualifications:Frontend Web Development: UI/UXPrior experience supporting Intelligence Community mission systems.Experience with messaging/event-driven architecture.Experience with observability, logging, monitoring, and application performance management.Advanced certifications such as AWS Certified Developer or Solutions Architect, CISSP, SAFe Agile or similar.